using System;
using System.Collections;
/*
 * Copyright 2004 Paulo Soares
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (the "License"); you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or any later version.
 *
 * This library is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE. See the GNU Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */

namespace iTextSharp.text.html.simpleparser {

public class ChainedProperties {
    
        public static int[] fontSizes = {8, 10, 12, 14, 18, 24, 36};
        public ArrayList chain = new ArrayList();
        
        /** Creates a new instance of ChainedProperties */
        public ChainedProperties() {
        }
        
        public String this[String key] {
            get {
                for (int k = chain.Count - 1; k >= 0; --k) {
                    Object[] obj = (Object[])chain[k];
                    Hashtable prop = (Hashtable)obj[1];
                    String ret = (String)prop[key];
                    if (ret != null)
                        return ret;
                }
                return null;
            }
        }
        
        public bool HasProperty(String key) {
            for (int k = chain.Count - 1; k >= 0; --k) {
                Object[] obj = (Object[])chain[k];
                Hashtable prop = (Hashtable)obj[1];
                if (prop.ContainsKey(key))
                    return true;
            }
            return false;
        }
        
        public void AddToChain(String key, Hashtable prop) {
            // adjust the font size
            String value = (String)prop[ElementTags.SIZE];
            if (value != null) {
                if (value.EndsWith("pt")) {
                    prop[ElementTags.SIZE] = value.Substring(0, value.Length - 2);
                }
                else {
                    int s = 0;
                    if (value.StartsWith("+") || value.StartsWith("-")) {
                        String old = this["basefontsize"];
                        if (old == null)
                            old = "12";
                        float f = float.Parse(old, System.Globalization.NumberFormatInfo.InvariantInfo);
                        int c = (int)f;
                        for (int k = fontSizes.Length - 1; k >= 0; --k) {
                            if (c >= fontSizes[k]) {
                                s = k;
                                break;
                            }
                        }
                        int inc = int.Parse(value.StartsWith("+") ? value.Substring(1) : value);
                        s += inc;
                    }
                    else {
                        try {
                            s = int.Parse(value) - 1;
                        }
                        catch {
                            s = 0;
                        }
                    }
                    if (s < 0)
                        s = 0;
                    else if (s >= fontSizes.Length)
                        s = fontSizes.Length - 1;
                    prop[ElementTags.SIZE] = fontSizes[s].ToString();
                }
            }
            chain.Add(new Object[]{key, prop});
        }
        
        public void RemoveChain(String key) {
            for (int k = chain.Count - 1; k >= 0; --k) {
                if (key.Equals(((Object[])chain[k])[0])) {
                    chain.RemoveAt(k);
                    return;
                }
            }
        }
    }
}